36Measuring Resistive SensorsAll excitations induce some self-heatingTrade between error and magnitude of signalLow enough excitations induce no noticeable errorExcitation can be pulsed on/off to minimize self-heatingLeads to transient increase in temp, so keep pulses shortMuch less predictable offsets than constant excitationCurrent running through remote measurement leads can drop voltage, resulting in measurement errorsLook for 3 wire and 4 wire configurations for more accuracyLook-up tables can be used to speed up calculationsLinear approximations between points on an exponential curveTrade between accuracy and computation time